Abstract
The reliability of the finite element prediction of the compliances of machine tool structures is investigated, with special reference to grinding machines. The structural model used assumes that the machine subassemblies are rigidly connected with each other. The compliances thus predicted are compared with their measured values. It was found that 70% of the static deflection between the grinding wheel and workpiece is due to the flexibility of sliding and clamped interfaces in the structure. Hence, the finite element prediction, with the assumptions made, does not yield reliable results. However, the technique is nevertheless useful for the design of the solid parts, and to a lesser extent for bolted sub-assemblies, i.e. for the machine bed, the effect of its rib construction, that of the number of supports and their location etc. For a reliable prediction of overall characteristics the flexibility of the sliding and clamped joints must be taken into consideration.
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